2011年秋季（9月）对格尔木河的浮游植物进行初步研究。结果表明：格尔木河浮游植物共计4门28种（属）。其中硅藻最多（14种属），占50．0％；绿藻次之（8种属），占28．6％；蓝藻（3种属），占10．7％：甲藻（2种属），占7．1％；隐藻（1种属），占3．6％。浮游植物优势种以硅藻为主，占61．5％，种类有小环藻（Cyclotella sp．）、普通等片藻（Diatoma vulgare）、针杆藻（Synedra sp．）、尖针杆藻（Synedra acus）、曲壳藻（Achnanthes sp．）、舟形藻（Navicula sp．）、桥弯藻（Cymbella sp．）、菱形硅藻（Nitzschia sp．）、颤藻（Oscillatoria sp．）、席藻（Phormidiltm sp．）和栅藻（Scenedemus sp．）。格尔木河浮游植物数量变化在4．43×10^4．60．66×10^4 cells／L之间，平均数量23．35×10^4 cells／L；生物量变化在0．0260～0．0476mg／L之间，平均0．0363mg／L。浮游植物平均数量以蓝藻最高，占86．0％；生物量以硅藻最高，占52．1％。分析显示各采样点浮游植物多样性指数、均匀度指数和物种丰富度指数均不高，平均值分别为1．80、0．43和1．49。上述结果表明该河段浮游植物群落结构较为简单，体现了格尔木河贫营养类型的特征。%Phytoplankton community in Geermu River of Caidamu River System was investigated in autumn（September）. Results showed that there 4 phyla including 28 species of phytoplankton in Geermu River of Caidamu River System in Autumn. Bacillariophyta were represented by the highest number of taxa （ 14 ）, follwed by Chlorophyta （8）, Cyanophyta （ 3 ）, Pyrrophyta （ 2 ） and Cryptophyta （ 1 ）. Baeillariophyta （ 61.5 % ） was dominate in dominate species. Cyclotella sp. , Diatoma vulgare, Synedra sp. , Synedra acus, Achnanthes sp. , Navicula sp. , CymbeUa sp. , Nitzschia sp. , Oscillatoria sp. , Phormidium sp. And Scenedemus sp. The abundance of phytoplankton ranged from 4.43 × 10^4 to 60. 66 × 10^4 cells/L, with the average of 23.35 × 10^4 cells/L, and the biomass of phytoplankton ranged from 0. 0260 -0. 0476 mg/L, with the average of 0. 0363 mg/ L. The abundance of Cyanophyta are the highest in all species, occupying 86.0%, The biomass of Bacillariophyta are the highest in all species, occupying 52. 1%. Shannon-Weaver index of diversity and the Pielou index and Margalef inder of phytoplankton were very low in every sampling sites, their mean values was 1.80 and 0. 43 and 1.49 ,respectively. These structure characteristics indicated that phytoplankton of this river was simple, Water quality was oligotrophic type.
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